Domain | Lower risk of bias | Higher risk of bias |
---|---|---|
Sampling and representativeness of the population | Consecutive patient recruitment or administrative database with random sampling | Non-consecutive patient recruitment or administrative database with non-random sampling |
Study type | International multicenter; multicenter in one country; single center, not single surgeon | Single surgeon series |
Source of information | Data abstracted by investigators from patient charts | Administrative database information |
Thromboprophylaxis documentation | Reporting of patients’ thromboprophylaxis | No reporting of patients’ thromboprophylaxis |
Diagnostic criteria | Objective confirmation of symptomatic venous thromboembolism | No objective confirmation of symptomatic venous thromboembolism |
Loss to follow-up | Less than 20% loss to follow-up | 20% or more loss to follow-up |